includes/ObjectCache.php

   1 <?php
   2 /**
   3  * @addtogroup Cache
   4  */
   5
   6 /**
   7  * FakeMemCachedClient imitates the API of memcached-client v. 0.1.2.
   8  * It acts as a memcached server with no RAM, that is, all objects are
   9  * cleared the moment they are set. All set operations succeed and all
  10  * get operations return null.
  11  * @addtogroup Cache
  12  */
  13 class FakeMemCachedClient {
  14         function add ($key, $val, $exp = 0) { return true; }
  15         function decr ($key, $amt=1) { return null; }
  16         function delete ($key, $time = 0) { return false; }
  17         function disconnect_all () { }
  18         function enable_compress ($enable) { }
  19         function forget_dead_hosts () { }
  20         function get ($key) { return null; }
  21         function get_multi ($keys) { return array_pad(array(), count($keys), null); }
  22         function incr ($key, $amt=1) { return null; }
  23         function replace ($key, $value, $exp=0) { return false; }
  24         function run_command ($sock, $cmd) { return null; }
  25         function set ($key, $value, $exp=0){ return true; }
  26         function set_compress_threshold ($thresh){ }
  27         function set_debug ($dbg) { }
  28         function set_servers ($list) { }
  29 }
  30
  31 global $wgCaches;
  32 $wgCaches = array();
  33
  34 /** @todo document */
  35 function &wfGetCache( $inputType ) {
  36         global $wgCaches, $wgMemCachedServers, $wgMemCachedDebug, $wgMemCachedPersistent;
  37         $cache = false;
  38
  39         if ( $inputType == CACHE_ANYTHING ) {
  40                 reset( $wgCaches );
  41                 $type = key( $wgCaches );
  42                 if ( $type === false || $type === CACHE_NONE ) {
  43                         $type = CACHE_DB;
  44                 }
  45         } else {
  46                 $type = $inputType;
  47         }
  48
  49         if ( $type == CACHE_MEMCACHED ) {
  50                 if ( !array_key_exists( CACHE_MEMCACHED, $wgCaches ) ){
  51                         require_once( 'memcached-client.php' );
  52
  53                         if (!class_exists("MemcachedClientforWiki")) {
  54                                 class MemCachedClientforWiki extends memcached {
  55                                         function _debugprint( $text ) {
  56                                                 wfDebug( "memcached: $text\n" );
  57                                         }
  58                                 }
  59                         }
  60
  61                         $wgCaches[CACHE_DB] = new MemCachedClientforWiki(
  62                                 array('persistant' => $wgMemCachedPersistent, 'compress_threshold' => 1500 ) );
  63                         $cache =& $wgCaches[CACHE_DB];
  64                         $cache->set_servers( $wgMemCachedServers );
  65                         $cache->set_debug( $wgMemCachedDebug );
  66                 }
  67         } elseif ( $type == CACHE_ACCEL ) {
  68                 if ( !array_key_exists( CACHE_ACCEL, $wgCaches ) ) {
  69                         if ( function_exists( 'eaccelerator_get' ) ) {
  70                                 $wgCaches[CACHE_ACCEL] = new eAccelBagOStuff;
  71                         } elseif ( function_exists( 'apc_fetch') ) {
  72                                 $wgCaches[CACHE_ACCEL] = new APCBagOStuff;
  73                         } elseif ( function_exists( 'mmcache_get' ) ) {
  74                                 $wgCaches[CACHE_ACCEL] = new TurckBagOStuff;
  75                         } else {
  76                                 $wgCaches[CACHE_ACCEL] = false;
  77                         }
  78                 }
  79                 if ( $wgCaches[CACHE_ACCEL] !== false ) {
  80                         $cache =& $wgCaches[CACHE_ACCEL];
  81                 }
  82         } elseif ( $type == CACHE_DBA ) {
  83                 if ( !array_key_exists( CACHE_DBA, $wgCaches ) ) {
  84                         $wgCaches[CACHE_DBA] = new DBABagOStuff;
  85                 }
  86                 $cache =& $wgCaches[CACHE_DBA];
  87         }
  88
  89         if ( $type == CACHE_DB || ( $inputType == CACHE_ANYTHING && $cache === false ) ) {
  90                 if ( !array_key_exists( CACHE_DB, $wgCaches ) ) {
  91                         $wgCaches[CACHE_DB] = new MediaWikiBagOStuff('objectcache');
  92                 }
  93                 $cache =& $wgCaches[CACHE_DB];
  94         }
  95
  96         if ( $cache === false ) {
  97                 if ( !array_key_exists( CACHE_NONE, $wgCaches ) ) {
  98                         $wgCaches[CACHE_NONE] = new FakeMemCachedClient;
  99                 }
 100                 $cache =& $wgCaches[CACHE_NONE];
 101         }
 102
 103         return $cache;
 104 }
 105
 106 function &wfGetMainCache() {
 107         global $wgMainCacheType;
 108         $ret =& wfGetCache( $wgMainCacheType );
 109         return $ret;
 110 }
 111
 112 function &wfGetMessageCacheStorage() {
 113         global $wgMessageCacheType;
 114         $ret =& wfGetCache( $wgMessageCacheType );
 115         return $ret;
 116 }
 117
 118 function &wfGetParserCacheStorage() {
 119         global $wgParserCacheType;
 120         $ret =& wfGetCache( $wgParserCacheType );
 121         return $ret;
 122 }
 123
 124 ?>